Superior Sensory, Motor, and Cognitive Performance in Elderly Individuals with Multi-Year Dancing Activities
Identifieur interne : 000279 ( Pmc/Corpus ); précédent : 000278; suivant : 000280Superior Sensory, Motor, and Cognitive Performance in Elderly Individuals with Multi-Year Dancing Activities
Auteurs : Jan-Christoph Kattenstroth ; Izabella Kolankowska ; Tobias Kalisch ; Hubert R. DinseSource :
- Frontiers in Aging Neuroscience [ 1663-4365 ] ; 2010.
Abstract
Aging is associated with a progressive decline of mental and physical abilities. Considering the current demographic changes in many civilizations there is an urgent need for measures permitting an independent lifestyle into old age. The critical role of physical exercise in mediating and maintaining physical and mental fitness is well-acknowledged. Dance, in addition to physical activity, combines emotions, social interaction, sensory stimulation, motor coordination and music, thereby creating enriched environmental conditions for human individuals. Here we demonstrate the impact of multi-year (average 16.5 years) amateur dancing (AD) in a group of elderly subjects (aged 65–84 years) as compared to education-, gender- and aged-matched controls (CG) having no record of dancing or sporting activities. Besides posture and balance parameters, we tested reaction times, motor behavior, tactile and cognitive performance. In each of the different domains investigated, the AD group had a superior performance as compared to the non-dancer CG group. Analysis of individual performance revealed that the best participants of the AD group were not better than individuals of the CG group. Instead, the AD group lacked individuals showing poor performance, which was frequently observed for the CG group. This observation implies that maintaining a regular schedule of dancing into old age can preserve cognitive, motor and perceptual abilities and prevent them from degradation. We conclude that the far-reaching beneficial effects found in the AD group make dance, beyond its ability to facilitate balance and posture, a prime candidate for the preservation of everyday life competence of elderly individuals.
Url:
DOI: 10.3389/fnagi.2010.00031
PubMed: 20725636
PubMed Central: 2917240
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PMC:2917240Le document en format XML
<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Superior Sensory, Motor, and Cognitive Performance in Elderly Individuals with Multi-Year Dancing Activities</title><author><name sortKey="Kattenstroth, Jan Christoph" sort="Kattenstroth, Jan Christoph" uniqKey="Kattenstroth J" first="Jan-Christoph" last="Kattenstroth">Jan-Christoph Kattenstroth</name><affiliation><nlm:aff id="aff1"><institution>Neural Plasticity Lab, Institute for Neuroinformatics, Ruhr-University Bochum</institution><country>Bochum, Germany</country></nlm:aff></affiliation></author><author><name sortKey="Kolankowska, Izabella" sort="Kolankowska, Izabella" uniqKey="Kolankowska I" first="Izabella" last="Kolankowska">Izabella Kolankowska</name><affiliation><nlm:aff id="aff1"><institution>Neural Plasticity Lab, Institute for Neuroinformatics, Ruhr-University Bochum</institution><country>Bochum, Germany</country></nlm:aff></affiliation></author><author><name sortKey="Kalisch, Tobias" sort="Kalisch, Tobias" uniqKey="Kalisch T" first="Tobias" last="Kalisch">Tobias Kalisch</name><affiliation><nlm:aff id="aff2"><institution>Department of Neurology, BG-Kliniken Bergmannsheil, Ruhr-University Bochum</institution><country>Bochum, Germany</country></nlm:aff></affiliation></author><author><name sortKey="Dinse, Hubert R" sort="Dinse, Hubert R" uniqKey="Dinse H" first="Hubert R." last="Dinse">Hubert R. Dinse</name><affiliation><nlm:aff id="aff1"><institution>Neural Plasticity Lab, Institute for Neuroinformatics, Ruhr-University Bochum</institution><country>Bochum, Germany</country></nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">20725636</idno><idno type="pmc">2917240</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2917240</idno><idno type="RBID">PMC:2917240</idno><idno type="doi">10.3389/fnagi.2010.00031</idno><date when="2010">2010</date><idno type="wicri:Area/Pmc/Corpus">000279</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000279</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Superior Sensory, Motor, and Cognitive Performance in Elderly Individuals with Multi-Year Dancing Activities</title><author><name sortKey="Kattenstroth, Jan Christoph" sort="Kattenstroth, Jan Christoph" uniqKey="Kattenstroth J" first="Jan-Christoph" last="Kattenstroth">Jan-Christoph Kattenstroth</name><affiliation><nlm:aff id="aff1"><institution>Neural Plasticity Lab, Institute for Neuroinformatics, Ruhr-University Bochum</institution><country>Bochum, Germany</country></nlm:aff></affiliation></author><author><name sortKey="Kolankowska, Izabella" sort="Kolankowska, Izabella" uniqKey="Kolankowska I" first="Izabella" last="Kolankowska">Izabella Kolankowska</name><affiliation><nlm:aff id="aff1"><institution>Neural Plasticity Lab, Institute for Neuroinformatics, Ruhr-University Bochum</institution><country>Bochum, Germany</country></nlm:aff></affiliation></author><author><name sortKey="Kalisch, Tobias" sort="Kalisch, Tobias" uniqKey="Kalisch T" first="Tobias" last="Kalisch">Tobias Kalisch</name><affiliation><nlm:aff id="aff2"><institution>Department of Neurology, BG-Kliniken Bergmannsheil, Ruhr-University Bochum</institution><country>Bochum, Germany</country></nlm:aff></affiliation></author><author><name sortKey="Dinse, Hubert R" sort="Dinse, Hubert R" uniqKey="Dinse H" first="Hubert R." last="Dinse">Hubert R. Dinse</name><affiliation><nlm:aff id="aff1"><institution>Neural Plasticity Lab, Institute for Neuroinformatics, Ruhr-University Bochum</institution><country>Bochum, Germany</country></nlm:aff></affiliation></author></analytic><series><title level="j">Frontiers in Aging Neuroscience</title><idno type="eISSN">1663-4365</idno><imprint><date when="2010">2010</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>Aging is associated with a progressive decline of mental and physical abilities. Considering the current demographic changes in many civilizations there is an urgent need for measures permitting an independent lifestyle into old age. The critical role of physical exercise in mediating and maintaining physical and mental fitness is well-acknowledged. Dance, in addition to physical activity, combines emotions, social interaction, sensory stimulation, motor coordination and music, thereby creating enriched environmental conditions for human individuals. Here we demonstrate the impact of multi-year (average 16.5 years) amateur dancing (AD) in a group of elderly subjects (aged 65–84 years) as compared to education-, gender- and aged-matched controls (CG) having no record of dancing or sporting activities. Besides posture and balance parameters, we tested reaction times, motor behavior, tactile and cognitive performance. In each of the different domains investigated, the AD group had a superior performance as compared to the non-dancer CG group. Analysis of individual performance revealed that the best participants of the AD group were not better than individuals of the CG group. Instead, the AD group lacked individuals showing poor performance, which was frequently observed for the CG group. This observation implies that maintaining a regular schedule of dancing into old age can preserve cognitive, motor and perceptual abilities and prevent them from degradation. We conclude that the far-reaching beneficial effects found in the AD group make dance, beyond its ability to facilitate balance and posture, a prime candidate for the preservation of everyday life competence of elderly individuals.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Adiputra, N" uniqKey="Adiputra N">N. Adiputra</name></author><author><name sortKey="Alex, P" uniqKey="Alex P">P. Alex</name></author><author><name sortKey="Sutjana, D" uniqKey="Sutjana D">D. Sutjana</name></author><author><name sortKey="Tirtayasa, K" uniqKey="Tirtayasa K">K. Tirtayasa</name></author><author><name sortKey="Manuaba, A" uniqKey="Manuaba A">A. Manuaba</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Alegria, J" uniqKey="Alegria J">J. 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Front Aging Neurosci</journal-id><journal-id journal-id-type="publisher-id">Front. Ag. Neurosci.</journal-id><journal-title-group><journal-title>Frontiers in Aging Neuroscience</journal-title></journal-title-group><issn pub-type="epub">1663-4365</issn><publisher><publisher-name>Frontiers Research Foundation</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">20725636</article-id><article-id pub-id-type="pmc">2917240</article-id><article-id pub-id-type="doi">10.3389/fnagi.2010.00031</article-id><article-categories><subj-group subj-group-type="heading"><subject>Neuroscience</subject><subj-group><subject>Original Research</subject></subj-group></subj-group></article-categories><title-group><article-title>Superior Sensory, Motor, and Cognitive Performance in Elderly Individuals with Multi-Year Dancing Activities</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Kattenstroth</surname><given-names>Jan-Christoph</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref></contrib><contrib contrib-type="author"><name><surname>Kolankowska</surname><given-names>Izabella</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref></contrib><contrib contrib-type="author"><name><surname>Kalisch</surname><given-names>Tobias</given-names></name><xref ref-type="aff" rid="aff2"><sup>2</sup></xref></contrib><contrib contrib-type="author"><name><surname>Dinse</surname><given-names>Hubert R.</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref><xref ref-type="author-notes" rid="fn001">*</xref></contrib></contrib-group><aff id="aff1"><sup>1</sup><institution>Neural Plasticity Lab, Institute for Neuroinformatics, Ruhr-University Bochum</institution><country>Bochum, Germany</country></aff><aff id="aff2"><sup>2</sup><institution>Department of Neurology, BG-Kliniken Bergmannsheil, Ruhr-University Bochum</institution><country>Bochum, Germany</country></aff><author-notes><fn fn-type="edited-by"><p>Edited by: Lars Nyberg, Umeå University, Sweden</p></fn><fn fn-type="edited-by"><p>Reviewed by: Fredrik Ullén, Stockholm Brain Institute, Sweden; Lars Nyberg, Umeå University, Sweden</p></fn><corresp id="fn001">*Correspondence: Hubert R. Dinse, Neural Plasticity Lab, Institute for Neuroinformatics, Ruhr-University Bochum, D-44780 Bochum, Germany. e-mail: <email>hubert.dinse@rub.de</email></corresp></author-notes><pub-date pub-type="epreprint"><day>24</day><month>5</month><year>2010</year></pub-date><pub-date pub-type="epub"><day>21</day><month>7</month><year>2010</year></pub-date><pub-date pub-type="collection"><year>2010</year></pub-date><volume>2</volume><elocation-id>31</elocation-id><history><date date-type="received"><day>02</day><month>4</month><year>2010</year></date><date date-type="accepted"><day>02</day><month>7</month><year>2010</year></date></history><permissions><copyright-statement>Copyright © 2010 Kattenstroth, Kolankowska, Kalisch and Dinse.</copyright-statement><copyright-year>2009</copyright-year><license license-type="open-access" xlink:href="http://www.frontiersin.org/licenseagreement"><license-p>This is an open-access article subject to an exclusive license agreement between the authors and the Frontiers Research Foundation, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are credited.</license-p></license></permissions><abstract><p>Aging is associated with a progressive decline of mental and physical abilities. Considering the current demographic changes in many civilizations there is an urgent need for measures permitting an independent lifestyle into old age. The critical role of physical exercise in mediating and maintaining physical and mental fitness is well-acknowledged. Dance, in addition to physical activity, combines emotions, social interaction, sensory stimulation, motor coordination and music, thereby creating enriched environmental conditions for human individuals. Here we demonstrate the impact of multi-year (average 16.5 years) amateur dancing (AD) in a group of elderly subjects (aged 65–84 years) as compared to education-, gender- and aged-matched controls (CG) having no record of dancing or sporting activities. Besides posture and balance parameters, we tested reaction times, motor behavior, tactile and cognitive performance. In each of the different domains investigated, the AD group had a superior performance as compared to the non-dancer CG group. Analysis of individual performance revealed that the best participants of the AD group were not better than individuals of the CG group. Instead, the AD group lacked individuals showing poor performance, which was frequently observed for the CG group. This observation implies that maintaining a regular schedule of dancing into old age can preserve cognitive, motor and perceptual abilities and prevent them from degradation. We conclude that the far-reaching beneficial effects found in the AD group make dance, beyond its ability to facilitate balance and posture, a prime candidate for the preservation of everyday life competence of elderly individuals.</p></abstract><kwd-group><kwd>aging</kwd><kwd>dance</kwd><kwd>successful aging</kwd><kwd>plasticity</kwd><kwd>neurotrophic factors</kwd><kwd>intervention</kwd><kwd>seniors</kwd><kwd>enriched environment</kwd></kwd-group><counts><fig-count count="2"></fig-count><table-count count="2"></table-count><equation-count count="0"></equation-count><ref-count count="83"></ref-count><page-count count="9"></page-count><word-count count="8555"></word-count></counts></article-meta></front><body><sec sec-type="introduction"><title>Introduction</title><p>Aging is associated with a progressive decline of perception, motor behavior, cognition and memory functions (Willis, <xref ref-type="bibr" rid="B81">1987</xref>; Mayer and Baltes, <xref ref-type="bibr" rid="B55">1996</xref>; Krampe, <xref ref-type="bibr" rid="B48">2002</xref>; Dinse, <xref ref-type="bibr" rid="B17">2006</xref>; Persson et al., <xref ref-type="bibr" rid="B60">2006</xref>; Dinse et al., <xref ref-type="bibr" rid="B20">2009</xref>), which is paralleled by a general decline of physical fitness (Buchner et al., <xref ref-type="bibr" rid="B7">1996</xref>; Samson et al., <xref ref-type="bibr" rid="B66">2000</xref>; Singh et al., <xref ref-type="bibr" rid="B70">2006</xref>). Conceivably, under these conditions, the preservation of everyday life competence and thus the maintenance of independent living are at severe risk. In particular, impaired mental and physical capacities increase the risk of falling with massive burden for the individual and the society (Lajoie and Gallagher, <xref ref-type="bibr" rid="B50">2004</xref>; Filiatrault et al., <xref ref-type="bibr" rid="B25">2009</xref>). Therefore, given the dramatic demographic changes of industrialized countries characterized by an increasing probability of reaching old and very old age, there is an urgent need for measures permitting an independent lifestyle into old age. Maintenance of independence in elderly individuals has been linked to the concept of “successful aging”, describing an avoidance of disease and disability, a maintenance of high physical and cognitive function, and a sustained engagement in social and productive activities (Rowe and Kahn, <xref ref-type="bibr" rid="B65">1997</xref>). In fact, in healthy elderly individuals there is a close association between physical fitness and cognitive performance (Colcombe et al., <xref ref-type="bibr" rid="B11">2004</xref>; Schaefer et al., <xref ref-type="bibr" rid="B68">2006</xref>; Sumic et al., <xref ref-type="bibr" rid="B74">2007</xref>). Consequently, many studies in elderlies have shown that improving aerobic capacities through physical exercise programs has beneficial effects on cognitive performance (Kramer et al., <xref ref-type="bibr" rid="B47">1999</xref>; Colcombe et al., <xref ref-type="bibr" rid="B10">2006</xref>; Deley et al., <xref ref-type="bibr" rid="B15">2007</xref>; Sumic et al., <xref ref-type="bibr" rid="B74">2007</xref>; Hillman et al., <xref ref-type="bibr" rid="B36">2008</xref>; Voelcker-Rehage et al., <xref ref-type="bibr" rid="B79">2010</xref>).</p><p>Animal research on the effects of physical exercise suggests a crucial involvement of brain-derived neurotrophin factors and other nerve growth factors (Neeper et al., <xref ref-type="bibr" rid="B58">1995</xref>; Churchill et al., <xref ref-type="bibr" rid="B8">2002</xref>), which play a fundamental role in control and maintenance of synaptic connections and plasticity. On the other hand, it is now well-documented that age-related changes are not a simple reflection of degenerative processes, but a complex mix of plastic and adaptive and compensatory mechanisms (Godde et al., <xref ref-type="bibr" rid="B30">2002</xref>; Dinse, <xref ref-type="bibr" rid="B17">2006</xref>; Persson et al., <xref ref-type="bibr" rid="B60">2006</xref>; David-Jürgens et al., <xref ref-type="bibr" rid="B14">2008</xref>), suggesting that brain plasticity is operational into old age. Therefore, new strategies for interventions such as training, exercising, practicing and stimulation, which make use of neuroplasticity principles, have been developed to maintain health and functional independence throughout lifespan. The effectiveness of stimulation and training procedures to ameliorate cortical and behavioral age-related degradation implies that aging effects are not irreversible but treatable (Bock and Schneider, <xref ref-type="bibr" rid="B4">2002</xref>; Sawaki et al., <xref ref-type="bibr" rid="B67">2003</xref>; Dinse, <xref ref-type="bibr" rid="B16">2005</xref>; Dinse et al., <xref ref-type="bibr" rid="B18">2005</xref>, <xref ref-type="bibr" rid="B19">2006</xref>; Mahncke et al., <xref ref-type="bibr" rid="B52">2006</xref>; Boyke et al., <xref ref-type="bibr" rid="B5">2008</xref>; Kalisch et al., <xref ref-type="bibr" rid="B41">2008</xref>, <xref ref-type="bibr" rid="B42">2010</xref>).</p><p>Several years ago, we demonstrated that housing aged rats under enriched environmental conditions delayed and ameliorated age-related deterioration of brain organization and sensorimotor behavior (Hilbig et al., <xref ref-type="bibr" rid="B35">2002</xref>, <xref ref-type="bibr" rid="B34">2007</xref>; Dinse, <xref ref-type="bibr" rid="B17">2006</xref>). Environmental enrichment of this type is believed to present animals with increased sensory, motor, and cognitive demands thereby enforcing physical exercise together with neuroplasticity processes. Given the fact that enriched environmental housing is a powerful tool to ameliorate age-related changes in rats, we proposed that dance represents an equivalent for enriched environmental conditions in humans since it comprises – beyond requirements for physical activity, rhythmic motor coordination, balance and memory – emotions, affection, social interaction, acoustic stimulation, and musical experience. In fact, using positron emission tomography has been shown recently that dancing elicits multisite brain activations (Brown et al., <xref ref-type="bibr" rid="B6">2006</xref>) implicating the involvement of wide-spread interacting brain networks. Moreover, as dancing can be performed at any level, which encourages regular and continued participation, it has a great appeal to many people resulting in a high compliance with little drop-outs.</p><p>For many of these reasons, dance has been established as a therapeutic tool for the treatment of Parkinson's disease (Fallik, <xref ref-type="bibr" rid="B23">2007</xref>; Earhart, <xref ref-type="bibr" rid="B21">2009</xref>; Hackney and Earhart, <xref ref-type="bibr" rid="B32">2009</xref>), dementia (Palo-Bengtsson and Ekman, <xref ref-type="bibr" rid="B59">2002</xref>; Hokkanen et al., <xref ref-type="bibr" rid="B37">2008</xref>), overweight children (Murphy et al., <xref ref-type="bibr" rid="B57">2009</xref>) and patients with serious mental illness (Hackney and Earhart, <xref ref-type="bibr" rid="B33">2010</xref>).</p><p>Most studies employing dancing as an intervention in elderly focused on improvement of cardiovascular parameters, muscle strength and of posture and balance (Hopkins et al., <xref ref-type="bibr" rid="B38">1990</xref>; Estivill, <xref ref-type="bibr" rid="B22">1995</xref>; Adiputra et al., <xref ref-type="bibr" rid="B1">1996</xref>; Crotts et al., <xref ref-type="bibr" rid="B13">1996</xref>; Shigematsu et al., <xref ref-type="bibr" rid="B69">2002</xref>; Federici et al., <xref ref-type="bibr" rid="B24">2005</xref>; Hui et al., <xref ref-type="bibr" rid="B39">2008</xref>; Kreutz, <xref ref-type="bibr" rid="B49">2008</xref>; Zhang et al., <xref ref-type="bibr" rid="B83">2008</xref>; Sofianidis et al., <xref ref-type="bibr" rid="B71">2009</xref>), with few studies addressing cognitive abilities (Verghese, <xref ref-type="bibr" rid="B78">2006</xref>; Alpert et al., <xref ref-type="bibr" rid="B3">2009</xref>). We here went one step further by hypothesizing that long-year dancing activity in an elderly population should promote general advantages including preservation of cognitive, motor and sensorimotor performance as well as perceptual abilities. This assumption was based on the one hand on far-reaching beneficial effects observed in aged rats under enriched environmental conditions, on the other hand, we expected a synergistic action of maintained physical exercise together with the impact of neuroplasticity mechanisms through principles of maintained sensory stimulation and maintained use. We therefore studied the impact of multi-year regular ballroom dancing in a group of neurologically healthy elderly subjects (amateur dancing; AD) in comparison to a passive control group (CG). Besides the recording of posture and balance parameters, we extended the assessment to measurements of cognitive, attentional, intellectual, perceptual and sensorimotor performance with the aim to cover basic measures of sensory and motor performance as well as rather complex tasks with higher cognitive demands. We found that in each of the different levels investigated, the AD group showed a superior performance as compared to the non-dancer CG indicating far-reaching beneficial effects of dancing beyond aspects of balance and posture.</p></sec><sec sec-type="materials|methods" id="s1"><title>Materials and Methods</title><sec><title>Subjects</title><p>A total of 62 healthy elderly volunteers (61–94 years) participated in our study. Subjects were recruited by advertisements in newspapers, poster-announcements and word-of-mouth advertising and agreed to report their medical history, actual medication and underwent the Mini Mental Status Examination (MMSE) (Folstein et al., <xref ref-type="bibr" rid="B26">1975</xref>), to test for dementia. The amateur dancer group (AD) (<italic>n</italic> = 24, 19 female, 71.69 ± 1.15 years) had a longtime history of amateur dancing (16.5 ± 12.7 years) with an average performing workload of 1.33 ± 0.24 h per week. The non-dancer CG consisted of 38 subjects (71.66 ± 1.13 years, 30 female) having no record of either dancing or sporting activities. The age-distribution (<italic>p</italic> = 0.859) and education level (number of school years, <italic>p</italic> = 0.603) of subjects across the groups was balanced. All subjects gave their written informed consent before participating. The study was approved by the local Ethics Committee of the Ruhr-University of Bochum.</p></sec><sec><title>Everyday competence</title><p>Lifestyle and general activity levels were assessed using the custom-made Everyday Competence Questionnaire” (ECQ, unpublished) addressing aspects of everyday life like independence in activities of daily living and mobility, social relations, general health status and life contentment. The compilation of questions used in the ECQ accounts for changed living conditions of today's seniors. The ECQ consisted of 17 items with one specific question per item characterizing so-called instrumental activities of daily living (IADL) such as housekeeping, daily routine, manual skills, mobility, sports, subjective well-being, linguistic abilities and leisure time activities (Willis, <xref ref-type="bibr" rid="B81">1987</xref>). These domains are not necessary for fundamental functioning, but they let an individual live independently in a community.</p><p>All subjects were asked to additionally comment on the questions as detailed as possible thereby allowing insight in their habits and living conditions. The answers were converted in scores according to an item-specific scale. Item 17 (“fluency of speech”) was exclusively based on the rating of the experimenter. Altogether subjects could achieve 0 to 54 points. The scores were normalized to a scale from 0 to 1 by dividing the number of points achieved by a subject with the maximum possible scores per item.</p></sec><sec><title>Cognitive performance</title><p>General intelligence was assessed using the Raven Standard Progressive Matrices (RSPM), a non-reading, non-language based measure of fluid intelligence (Raven, <xref ref-type="bibr" rid="B64">1938</xref>). The test was administered according to standard instructions with a 30-min time constraint. In the CG, the RSPM was conducted in a pre/post design to provide data for a separate study. Therefore, for both groups we here used odd-numbered items only. In addition, the non-verbal geriatric concentration test (AKT) was run to assess selective attention and concentration (Gatterer, <xref ref-type="bibr" rid="B27">1990</xref>). For this paper-and-pencil test, subjects had to mark 20 symbols out of 55 similar looking patterns within a time-limit of 30 s. After an initial training session, three consecutive sessions were run and averaged for evaluating individual performance.</p></sec><sec><title>Multiple-choice reaction time measurement (RT)</title><p>We performed multiple-choice reaction time measurements in a finger selection visuo-tactile task as adopted from Alegria and Bertelson (<xref ref-type="bibr" rid="B2">1970</xref>). Subjects were seated 3 m in front of a monitor. An image of each hand was displayed on the monitor and 1 finger out of 10 was selected by a visual marker. Subjects had to press the key corresponding to the selected finger on a hand-shaped 10 button keyboard as fast as possible. One session consisted of 4 blocks of 100 trials each, which were separated by a short break after each block. Maximum response to stimulus interval for each trial was 2000 ms. Each finger was tested 40 times in random order.</p></sec><sec><title>Posture, balance and gait control</title><p>Three tests were used to assess the subjects’ ability to control their posture, to maintain balance and to evaluate their security of gait. The <italic>Romberg test</italic> is a standard neurological test addressing joint position sense (proprioception), and was applied in a condition with eyes either open or closed (Lanska and Goetz, <xref ref-type="bibr" rid="B51">2000</xref>; Goble et al., <xref ref-type="bibr" rid="B29">2009</xref>). The subjects were asked to stand upright with their feet in tandem stance. The movements of the body in relation to a perpendicular object behind the subject were monitored. A second experimenter was standing close to the subject to prevent the person from falling. The time until a subject starts to loose balance was recorded (maximal testing-time was limited to 1 min). In the <italic>timed</italic> <italic>up&go test</italic> subjects were asked to stand up from a sitting position, walk 3 m, return to the chair and sit down again (Podsiadlo and Richardson, <xref ref-type="bibr" rid="B62">1991</xref>). The time to fulfill the task was measured. In the s<italic>tanding-turn-test</italic> a standing subject was asked to perform a 360° turn (Tinetti, <xref ref-type="bibr" rid="B75">1986</xref>). Time and number of steps were documented.</p></sec><sec><title>Motor performance</title><p>Hand-arm fine-motor performance was evaluated using a commercial, computer-based test-battery for clinical neuropsychological research (MLS, Dr. G. Schuhfried GmbH, Mödling, Austria) as described previously (Kalisch et al., <xref ref-type="bibr" rid="B43">2006</xref>). The system consists of a work plate with two pencils for left and right hand use. All parts of the system are connected to an interface and a PC computer to record the time and number of errors during different tasks. We investigated speed, accuracy, and maintenance of upper limb position during execution of fine-motor movements of the left and right arm, hand, and fingers using following tests:</p><sec><title>Steadiness</title><p>Steadiness evaluates the ability to obtain a prescribed arm-hand position and to maintain it for a defined time period. Subjects were asked to place the pencil into a small circular hole (5.8 mm) of the horizontally positioned board, and hold it there without touching the edges for 32 s without support of the hand. This task tests the ability to hold a steady position, and allows an estimate of postural tremor. Dependent variables were the number of errors, i.e., the number of contacts of the pencil with the wall of the hole.</p></sec><sec><title>Aiming</title><p>Aiming evaluates the ability to accomplish fast arm-hand movements for small targets. Subjects had to consecutively hit 20 linearly arranged small contact fields (diameter 5 mm, midpoint separation 9 mm) with a test pencil. This test assesses the degree of ataxia and the speed of movement by the ability to make rapid repeated aimed movements. The dependent variables were the number of errors (missed contact fields) and the total time needed to complete the task.</p></sec><sec><title>Pin plugging</title><p>Pin plugging evaluates fine and gross motor dexterity and coordination. The board carries two rows of 25 small holes, one on the left side and one on the right side. Two containers, each equipped with 25 metal pins, were placed in 30 cm distance from the right and left side of the board. The subjects were asked to pick the pins with their right hand, one by one, from the right container and insert them into the holes on the peg-board. Subsequently the test was continued using the left hand and left container. If one of the metal pins dropped during the transfer, they were instructed to go on with the next one. Time to complete the test was assessed.</p></sec><sec><title>Tapping</title><p>Tapping evaluates the ability to perform very fast, repetitive wrist-finger movements with little emphasis on precision of movement. Subjects were required to hit a square contact plate (40 by 40 mm) on the test board with a test pencil as frequently as possible. The measured parameter was number of hits achieved in a time interval of 32 s, which provides a measure of the speed of antagonistic oscillation. In this task, support of the forearm was allowed. Therefore, the repetitive contacts had to be accomplished by wrist movements.</p></sec></sec><sec><title>Tactile performance</title><sec><title>Touch threshold</title><p>Touch threshold was evaluated by probing the fingertips with von Frey filaments (Marstocknervtest, Marburg, Germany). Each filament was calibrated to a known buckling force determined by its length and diameter. The test kit contained 16 different filaments calibrated to forces ranging from 0.25–294 mN in logarithmic scaling. Additional two filaments (Touch Test, Stoelting Co, Wood Dale, IL, USA) with forces of 0.08 mN and 0.20 mN were used to expand the effective test range. Fine-touch sensitivity was tested with a staircase procedure, during which subjects were required to indicate whenever they perceived an indentation. The applied contact forces were decreased in a stepwise manner until the subjects no longer perceived the stimulus (lower boundary), and then increased until the stimulus was perceived again (upper boundary). This procedure was repeated three times, resulting in six values that were averaged to form the absolute touch threshold.</p></sec><sec><title>Two-point-discrimination threshold (2pd)</title><p>Spatial 2pd thresholds were assessed on the tips of the left (LID) and right (RID) index finger using the method of constant stimuli as described previously (Dinse, <xref ref-type="bibr" rid="B16">2005</xref>; Kalisch et al., <xref ref-type="bibr" rid="B40">2007</xref>, <xref ref-type="bibr" rid="B41">2008</xref>). We tested seven pairs of brass needles; in addition zero distance was tested with a single needle. To overcome problems in the use of two-point measurements associated with hand-held probes, we used a specifically designed apparatus that assure a standardized form of testing (cf. Figures in Dinse et al., <xref ref-type="bibr" rid="B18">2005</xref>, <xref ref-type="bibr" rid="B19">2006</xref>). We used needle separations of 1.5, 2.3, 3.1, 3.9, 4.7, 5.6 and 7 mm. The diameter of the needles was 0.7 mm and the diameter of the blunt endings was 200 μm. Application-force was about 150 to 200 mN. All conditions were presented eight times in randomized order resulting in 64 tests per session. As described previously, test-retest reliability using this procedure was 0.90 for young subjects, and 0.88 for elderly participants (Dinse et al., <xref ref-type="bibr" rid="B19">2006</xref>). Subjects, who were not informed about the ratio of needle-pairs and single needles, which was 7:1, had to decide immediately if they had the sensation of one or two needles. They were instructed to classify the percept of a single needle or doubtful stimuli as “one” but the distinct percept of two stimuli as “two”. The summed responses were plotted against the needle-distances resulting in a psychometric function, which was fitted by a binary logistic regression (SPSS; SPSS Inc., USA). Threshold was taken from the fit where 50% correct responses were reached.</p></sec></sec><sec><title>Domains</title><p>To collapse the data obtained for the various tests, we formed five domains covering similar functional categories. “Cognitive performance” comprised data from the <italic>AKT</italic> and the <italic>RSPM</italic>. “Tactile performance” comprised data from <italic>touch threshold</italic> and <italic>2pd</italic>. “Posture&balance” comprised data from the <italic>Romberg test</italic>, the <italic>timed up&go test</italic> and the <italic>standing-turn test</italic>. “Motor performance” comprised <italic>Steadiness</italic>, <italic>Aiming</italic>, <italic>Pin plugging and Tapping</italic>. A separate domain “RT” was introduced to cover data from the multiple-choice reaction time task.</p></sec><sec><title>Indices of performance (IP)</title><p>To compare performances across all tests and all subjects of both groups we calculated normalized performance indices for each subject and each test as (wp-ip)/(wp-bp), where wp is the worst performance of all subjects, ip is the individual performance, and bp is the best performance of all subjects. Best IP is 1, while worst IP is 0. Indices were subsequently averaged across tasks belonging to a particular domain as described above.</p></sec><sec><title>Data analysis</title><p>In all cases we report averages and standard error of the mean (SEM). We hypothesized the AD group to show at least a comparable, or a superior performance in comparison to the CG group. Therefore we used a one-tailed Student's <italic>t</italic>-test to detect differences between the two groups. Alpha levels were adjusted according to Bonferroni's method (23 tests). Moreover, we computed effect sizes according to Cohen's d (Cohen, <xref ref-type="bibr" rid="B9">1988</xref>). For tests of differences in the distribution we used Chi-square statistics. A <italic>p</italic>-value of <0.05 was considered significant. In order to detect possible relationships between dance experience and performance, correlation analysis were conducted using Pearson's linear correlation coefficients for total dance experience (years) and average workload (minutes week).</p></sec></sec><sec><title>Results</title><p>We tested cognitive, perceptual and motor performance in two groups of age- and education-matched elderly participants who had a long-year record of regular AD or no dancing experience (control group; CG). We found that the AD group had a superior performance in most of the tests investigated. In Table <xref ref-type="table" rid="T1">1</xref>, all mean values (±SEM) are shown for each task together with the result of the <italic>t</italic>-test comparing both groups. Performance for individual tests is illustrated in Figure <xref ref-type="fig" rid="F1">1</xref>.</p><table-wrap id="T1" position="float"><label>Table 1</label><caption><p><bold>Comparison of cognitive, posture, balance and sensorimotor status of AD and CG</bold>.</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="left" rowspan="1" colspan="1">Variables</th><th align="left" rowspan="1" colspan="1">AD</th><th align="left" rowspan="1" colspan="1">(Range)</th><th align="left" rowspan="1" colspan="1">CG</th><th align="left" rowspan="1" colspan="1">(Range)</th><th align="left" rowspan="1" colspan="1"><italic>p</italic> – value corrected</th><th align="left" rowspan="1" colspan="1">Effect strength</th></tr></thead><tbody><tr><td align="left" rowspan="1" colspan="1">Age [years]</td><td align="left" rowspan="1" colspan="1">71.69 ± 1.15</td><td align="left" rowspan="1" colspan="1">(65–84)</td><td align="left" rowspan="1" colspan="1">71.66 ± 1.13</td><td align="left" rowspan="1" colspan="1">(61–94)</td><td align="left" rowspan="1" colspan="1">0.859</td><td align="left" rowspan="1" colspan="1"></td></tr><tr><td align="left" rowspan="1" colspan="1">Female [%]</td><td align="left" rowspan="1" colspan="1">79.17</td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1">78.94</td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1">0.961</td><td align="left" rowspan="1" colspan="1"></td></tr><tr><td align="left" rowspan="1" colspan="1">Education level [school years]</td><td align="left" rowspan="1" colspan="1">9.88 ± 0.45</td><td align="left" rowspan="1" colspan="1">(7–13)</td><td align="left" rowspan="1" colspan="1">10.16 ± 0.33</td><td align="left" rowspan="1" colspan="1">(6–13)</td><td align="left" rowspan="1" colspan="1">0.603</td><td align="left" rowspan="1" colspan="1"></td></tr><tr><td align="left" rowspan="1" colspan="1">Everyday competence (ECQ)</td><td align="left" rowspan="1" colspan="1">10.71 ± 0.36</td><td align="left" rowspan="1" colspan="1">(7.56–13.85)</td><td align="left" rowspan="1" colspan="1">8.43 ± 0.34</td><td align="left" rowspan="1" colspan="1">(5.04–12.59)</td><td align="left" rowspan="1" colspan="1">≤0.001</td><td align="left" rowspan="1" colspan="1">1.21</td></tr><tr><td align="left" colspan="7" rowspan="1"><bold>COGNITION</bold></td></tr><tr><td align="left" rowspan="1" colspan="1">RSPM<sup>1</sup></td><td align="left" rowspan="1" colspan="1">19.55 ± 0.69</td><td align="left" rowspan="1" colspan="1">(14–26.5)</td><td align="left" rowspan="1" colspan="1">15.39 ± 0.83</td><td align="left" rowspan="1" colspan="1">(7–28)</td><td align="left" rowspan="1" colspan="1">0.015</td><td align="left" rowspan="1" colspan="1">0.97</td></tr><tr><td align="left" rowspan="1" colspan="1">Geriatric concentration test (AKT)</td><td align="left" rowspan="1" colspan="1">54.29 ± 0.13</td><td align="left" rowspan="1" colspan="1">(52.67–55)</td><td align="left" rowspan="1" colspan="1">53.49 ± 0.29</td><td align="left" rowspan="1" colspan="1">(47–55)</td><td align="left" rowspan="1" colspan="1">0.590</td><td align="left" rowspan="1" colspan="1">0.59</td></tr><tr><td align="left" colspan="7" rowspan="1"><bold>REACTION TIMES</bold></td></tr><tr><td align="left" rowspan="1" colspan="1">Multiple-choice reaction times [ms], L</td><td align="left" rowspan="1" colspan="1">690.93 ± 20.73</td><td align="left" rowspan="1" colspan="1">(503.35–933.41)</td><td align="left" rowspan="1" colspan="1">780.30 ± 19.39</td><td align="left" rowspan="1" colspan="1">(581.01–1081.17)</td><td align="left" rowspan="1" colspan="1">0.017</td><td align="left" rowspan="1" colspan="1">0.90</td></tr><tr><td align="left" rowspan="1" colspan="1">Multiple-choice reaction times [ms], R</td><td align="left" rowspan="1" colspan="1">677.52 ± 17.89</td><td align="left" rowspan="1" colspan="1">(518.55–868.24)</td><td align="left" rowspan="1" colspan="1">760.32 ± 18.01</td><td align="left" rowspan="1" colspan="1">(580.51–1012.44)</td><td align="left" rowspan="1" colspan="1">0.039</td><td align="left" rowspan="1" colspan="1">0.83</td></tr><tr><td align="left" colspan="7" rowspan="1"><bold>POSTURE&BALANCE</bold></td></tr><tr><td align="left" rowspan="1" colspan="1">Romberg test [s], eyes open</td><td align="left" rowspan="1" colspan="1">35.14 ± 3.71</td><td align="left" rowspan="1" colspan="1">(12–60)</td><td align="left" rowspan="1" colspan="1">25.29 ± 4.40</td><td align="left" rowspan="1" colspan="1">(7.22–60)</td><td align="left" rowspan="1" colspan="1">1.0</td><td align="left" rowspan="1" colspan="1">0.69</td></tr><tr><td align="left" rowspan="1" colspan="1">Romberg test [s], eyes closed</td><td align="left" rowspan="1" colspan="1">16.78 ± 2.38</td><td align="left" rowspan="1" colspan="1">(5.35–32)</td><td align="left" rowspan="1" colspan="1">14.44 ± 4.33</td><td align="left" rowspan="1" colspan="1">(2–42)</td><td align="left" rowspan="1" colspan="1">1.0</td><td align="left" rowspan="1" colspan="1">0.20</td></tr><tr><td align="left" rowspan="1" colspan="1">Standing-turn [steps]</td><td align="left" rowspan="1" colspan="1">4.41 ± 0.10</td><td align="left" rowspan="1" colspan="1">(4–5)</td><td align="left" rowspan="1" colspan="1">5.64 ± 0.47</td><td align="left" rowspan="1" colspan="1">(3–8)</td><td align="left" rowspan="1" colspan="1">0.027</td><td align="left" rowspan="1" colspan="1">1.31</td></tr><tr><td align="left" rowspan="1" colspan="1">Standing-turn [s]</td><td align="left" rowspan="1" colspan="1">2.39 ± 0.20</td><td align="left" rowspan="1" colspan="1">(1.42–4.30)</td><td align="left" rowspan="1" colspan="1">3.21 ± 0.33</td><td align="left" rowspan="1" colspan="1">(1.77–5.09)</td><td align="left" rowspan="1" colspan="1">0.460</td><td align="left" rowspan="1" colspan="1">0.88</td></tr><tr><td align="left" rowspan="1" colspan="1">Up&go [s]</td><td align="left" rowspan="1" colspan="1">6.09 ± 0.24</td><td align="left" rowspan="1" colspan="1">(4.48–8)</td><td align="left" rowspan="1" colspan="1">7.42 ± 0.25</td><td align="left" rowspan="1" colspan="1">(5.54–8.54)</td><td align="left" rowspan="1" colspan="1">0.013</td><td align="left" rowspan="1" colspan="1">1.46</td></tr><tr><td align="left" colspan="7" rowspan="1"><bold>MOTOR PERFORMANCE</bold></td></tr><tr><td align="left" rowspan="1" colspan="1">Hand-arm steadiness</td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td></tr><tr><td align="left" rowspan="1" colspan="1">Steadiness [error], L</td><td align="left" rowspan="1" colspan="1">1.57 ± 0.86</td><td align="left" rowspan="1" colspan="1">(0–9)</td><td align="left" rowspan="1" colspan="1">15.82 ± 2.49</td><td align="left" rowspan="1" colspan="1">(0–54)</td><td align="left" rowspan="1" colspan="1">0.016</td><td align="left" rowspan="1" colspan="1">1.29</td></tr><tr><td align="left" rowspan="1" colspan="1">Steadiness [error], R</td><td align="left" rowspan="1" colspan="1">3.14 ± 1.04</td><td align="left" rowspan="1" colspan="1">(0–12)</td><td align="left" rowspan="1" colspan="1">13.08 ± 2.72</td><td align="left" rowspan="1" colspan="1">(0–71)</td><td align="left" rowspan="1" colspan="1">0.442</td><td align="left" rowspan="1" colspan="1">0.82</td></tr><tr><td align="left" rowspan="1" colspan="1">Control Precision</td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td></tr><tr><td align="left" rowspan="1" colspan="1">Aiming [error], L</td><td align="left" rowspan="1" colspan="1">1.50 ± 0.43</td><td align="left" rowspan="1" colspan="1">(0–6)</td><td align="left" rowspan="1" colspan="1">1.00 ± 0.26</td><td align="left" rowspan="1" colspan="1">(0–5)</td><td align="left" rowspan="1" colspan="1">1.0</td><td align="left" rowspan="1" colspan="1">0.31</td></tr><tr><td align="left" rowspan="1" colspan="1">Aiming [error], R</td><td align="left" rowspan="1" colspan="1">0.14 ± 0.10</td><td align="left" rowspan="1" colspan="1">(0–1)</td><td align="left" rowspan="1" colspan="1">1.87 ± 0.27</td><td align="left" rowspan="1" colspan="1">(0–6)</td><td align="left" rowspan="1" colspan="1">0.005</td><td align="left" rowspan="1" colspan="1">1.42</td></tr><tr><td align="left" rowspan="1" colspan="1">Aiming [s], L</td><td align="left" rowspan="1" colspan="1">10.01 ± 0.96</td><td align="left" rowspan="1" colspan="1">(0.01–15.84)</td><td align="left" rowspan="1" colspan="1">11.18 ± 0.40</td><td align="left" rowspan="1" colspan="1">(7.19–18.37)</td><td align="left" rowspan="1" colspan="1">1.0</td><td align="left" rowspan="1" colspan="1">0.38</td></tr><tr><td align="left" rowspan="1" colspan="1">Aiming [s], R</td><td align="left" rowspan="1" colspan="1">9.48 ± 0.50</td><td align="left" rowspan="1" colspan="1">(6.66–13.74)</td><td align="left" rowspan="1" colspan="1">10.66 ± 0.28</td><td align="left" rowspan="1" colspan="1">(7.96–17.11)</td><td align="left" rowspan="1" colspan="1">0.470</td><td align="left" rowspan="1" colspan="1">0.66</td></tr><tr><td align="left" rowspan="1" colspan="1">Pin plugging [s], L</td><td align="left" rowspan="1" colspan="1">45.85 ± 1.79</td><td align="left" rowspan="1" colspan="1">(37.48–63.76)</td><td align="left" rowspan="1" colspan="1">48.84 ± 0.89</td><td align="left" rowspan="1" colspan="1">(37.64–62.45)</td><td align="left" rowspan="1" colspan="1">1.0</td><td align="left" rowspan="1" colspan="1">0.49</td></tr><tr><td align="left" rowspan="1" colspan="1">Pin plugging [s], R</td><td align="left" rowspan="1" colspan="1">43.64 ± 1.25</td><td align="left" rowspan="1" colspan="1">(38.06–52.98)</td><td align="left" rowspan="1" colspan="1">48.31 ± 1.12</td><td align="left" rowspan="1" colspan="1">(37–64.64)</td><td align="left" rowspan="1" colspan="1">0.305</td><td align="left" rowspan="1" colspan="1">0.79</td></tr><tr><td align="left" rowspan="1" colspan="1">Rate of wrist movement</td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td></tr><tr><td align="left" rowspan="1" colspan="1">Tapping [hits], L</td><td align="left" rowspan="1" colspan="1">174.75 ± 3.85</td><td align="left" rowspan="1" colspan="1">(138–202)</td><td align="left" rowspan="1" colspan="1">154.63 ± 3.55</td><td align="left" rowspan="1" colspan="1">(102–207)</td><td align="left" rowspan="1" colspan="1">0.006</td><td align="left" rowspan="1" colspan="1">0.99</td></tr><tr><td align="left" rowspan="1" colspan="1">Tapping [hits], R</td><td align="left" rowspan="1" colspan="1">191.58 ± 3.52</td><td align="left" rowspan="1" colspan="1">(153–212)</td><td align="left" rowspan="1" colspan="1">180.13 ± 3.97</td><td align="left" rowspan="1" colspan="1">(107–230)</td><td align="left" rowspan="1" colspan="1">0.652</td><td align="left" rowspan="1" colspan="1">0.54</td></tr><tr><td align="left" colspan="7" rowspan="1"><bold>TACTILE PERFORMANCE</bold></td></tr><tr><td align="left" rowspan="1" colspan="1">Touch threshold [mN], LID</td><td align="left" rowspan="1" colspan="1">0.21 ± 0.01</td><td align="left" rowspan="1" colspan="1">(0.15–0.31)</td><td align="left" rowspan="1" colspan="1">0.22 ± 0.02</td><td align="left" rowspan="1" colspan="1">(0.08–0.54)</td><td align="left" rowspan="1" colspan="1">1.0</td><td align="left" rowspan="1" colspan="1">0.19</td></tr><tr><td align="left" rowspan="1" colspan="1">Touch threshold [mN], RID</td><td align="left" rowspan="1" colspan="1">0.27 ± 0.02</td><td align="left" rowspan="1" colspan="1">(0.20–0.39)</td><td align="left" rowspan="1" colspan="1">0.34 ± 0.04</td><td align="left" rowspan="1" colspan="1">(0.08–0.94)</td><td align="left" rowspan="1" colspan="1">1.0</td><td align="left" rowspan="1" colspan="1">0.45</td></tr><tr><td align="left" rowspan="1" colspan="1">2-Point-discrimination-threshold [mm], LID</td><td align="left" rowspan="1" colspan="1">2.90 ± 0.07</td><td align="left" rowspan="1" colspan="1">(2.26–3.30)</td><td align="left" rowspan="1" colspan="1">3.45 ± 0.09</td><td align="left" rowspan="1" colspan="1">(2.20–4.64)</td><td align="left" rowspan="1" colspan="1">0.003</td><td align="left" rowspan="1" colspan="1">1.30</td></tr><tr><td align="left" rowspan="1" colspan="1">2-Point-discrimination-threshold [mm], RID</td><td align="left" rowspan="1" colspan="1">3.15 ± 0.07</td><td align="left" rowspan="1" colspan="1">(2.77–3.61)</td><td align="left" rowspan="1" colspan="1">3.59 ± 0.07</td><td align="left" rowspan="1" colspan="1">(2.89–4.58)</td><td align="left" rowspan="1" colspan="1">0.002</td><td align="left" rowspan="1" colspan="1">1.28</td></tr></tbody></table><table-wrap-foot><p><italic>AD, amateur dancer; CG, control group; L, left hand; R, right hand; LID, left index finger; RID, right index finger. Values are means, SEM. <sup>1</sup>Raven Standard Progressive Matrices, subset of 30 items</italic>.</p></table-wrap-foot></table-wrap><fig id="F1" position="float"><label>Figure 1</label><caption><p><bold>Performance of amateur dancers (AD) and a matched control group (CG) for selected tests covering cognitive, posture&balance, motor and tactile domains</bold>. Participants of the AD group showed <bold>(A)</bold> higher scores in the RSPM (<italic>p</italic> = 0.015), <bold>(B)</bold> shorter <italic>Up&go</italic> times (<italic>p</italic> = 0.013), <bold>(C)</bold> shorter task completion times (<italic>p</italic> = 0.305) in the <italic>Pin plugging</italic> test (right hand), and <bold>(D)</bold> lower <italic>2-Point-discrimination threshold</italic> (right index finger) (<italic>p</italic> = 0.002). The horizontal lines within the boxes represent the medians. Boxes show the top and bottom quartiles and whiskers represent the minima and maxima within 1.5 interquartile range (IQR). Outliers (>3.0 IQR) are labeled as solid dots.</p></caption><graphic xlink:href="fnagi-02-00031-g001"></graphic></fig><p>Everyday competence was assessed using the ECQ. The AD group showed a significantly higher ECQ-score than the CG group. In the tests assessing cognitive performance, the AD group had higher scores in both the <italic>RSPM</italic> (Figure <xref ref-type="fig" rid="F1">1</xref>A) and the <italic>AKT</italic>. Reaction times obtained for the multiple-choice RT task were averaged for the left and right hand. For both hands, the AD group had faster RTs.</p><p>When testing posture and balance we found no differences for the <italic>Romberg test</italic>, neither for the parameter [eyes open] nor [eyes closed]. In contrast, for the s<italic>tanding-turn test</italic> participants of the AD group needed fewer steps for completion. Moreover, the AD group was faster in the <italic>timed up&go</italic> task (Figure <xref ref-type="fig" rid="F1">1</xref>B). In the motor domain, for the subtest <italic>Steadiness</italic> for the left hand the number of errors was higher in the CG group. The subtest <italic>Aiming</italic> revealed better performance for the parameter [error] for the right, but not for the left hand. Although significance criteria was missed, in the subtest <italic>Pin plugging</italic> the AD group was faster with both hands (Figure <xref ref-type="fig" rid="F1">1</xref>C). Significant differences for the left hand was found for the subtest <italic>Tapping</italic>, where the AD group reached higher rates. <italic>Touch thresholds</italic> revealed no differences between groups, but 2pd <italic>thresholds</italic> for the index fingers of both hands were lower in the AD group (Figure <xref ref-type="fig" rid="F1">1</xref>D).</p><p>Correlation analyses revealed significant correlations only between individual dance workload per week and 2pd thresholds of the right index finger (Pearson's <italic>r</italic> = 0.566, <italic>p</italic> = 0.018), and between individual dance experience (years) and Romberg test performed with eyes closed (Pearson's <italic>r</italic> = 0.571, <italic>p</italic> = 0.033).</p><sec><title>Indices of performance (IP)</title><p>The calculation of IP for each test and each subject allowed a direct comparison of performances across all tests and all subjects, and a grouping into functional domains as defined in Section <xref ref-type="sec" rid="s1">“Materials and Methods”</xref>. As shown in Table <xref ref-type="table" rid="T2">2</xref> and Figure <xref ref-type="fig" rid="F2">2</xref>, in all domains, which assemble all tests applied, the AD group showed significant higher IPs, with the largest advantage for posture and balance parameters.</p><table-wrap id="T2" position="float"><label>Table 2</label><caption><p><bold>Indices of performance (IP) averaged across individual tasks describing cognition, reaction times, posture&balance, and motor and tactile performance for both groups</bold>.</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="left" rowspan="1" colspan="1">Domain</th><th align="left" rowspan="1" colspan="1">AD</th><th align="left" rowspan="1" colspan="1">(Range)</th><th align="left" rowspan="1" colspan="1">CG</th><th align="left" rowspan="1" colspan="1">(Range)</th><th align="left" rowspan="1" colspan="1"><italic>p</italic> – value corrected</th><th align="left" rowspan="1" colspan="1">Effect strength</th></tr></thead><tbody><tr><td align="left" rowspan="1" colspan="1">Cognitive performance</td><td align="left" rowspan="1" colspan="1">0.76 ± 0.03</td><td align="left" rowspan="1" colspan="1">(0.33–1)</td><td align="left" rowspan="1" colspan="1">0.61 ± 0.04</td><td align="left" rowspan="1" colspan="1">(0–1)</td><td align="left" rowspan="1" colspan="1">0.010</td><td align="left" rowspan="1" colspan="1">0.58</td></tr><tr><td align="left" rowspan="1" colspan="1">Reaction time</td><td align="left" rowspan="1" colspan="1">0.69 ± 0.03</td><td align="left" rowspan="1" colspan="1">(0.26–1)</td><td align="left" rowspan="1" colspan="1">0.52 ± 0.02</td><td align="left" rowspan="1" colspan="1">(0–0.87)</td><td align="left" rowspan="1" colspan="1">0.003</td><td align="left" rowspan="1" colspan="1">0.87</td></tr><tr><td align="left" rowspan="1" colspan="1">Posture&balance</td><td align="left" rowspan="1" colspan="1">0.68 ± 0.02</td><td align="left" rowspan="1" colspan="1">(0.08–1)</td><td align="left" rowspan="1" colspan="1">0.37 ± 0.04</td><td align="left" rowspan="1" colspan="1">(0–1)</td><td align="left" rowspan="1" colspan="1">≤0.001</td><td align="left" rowspan="1" colspan="1">1.28</td></tr><tr><td align="left" rowspan="1" colspan="1">Motor performance</td><td align="left" rowspan="1" colspan="1">0.81 ± 0.01</td><td align="left" rowspan="1" colspan="1">(0–1)</td><td align="left" rowspan="1" colspan="1">0.70 ± 0.01</td><td align="left" rowspan="1" colspan="1">(0–1)</td><td align="left" rowspan="1" colspan="1">0.012</td><td align="left" rowspan="1" colspan="1">0.47</td></tr><tr><td align="left" rowspan="1" colspan="1">Tactile performance</td><td align="left" rowspan="1" colspan="1">0.75 ± 0.01</td><td align="left" rowspan="1" colspan="1">(0.51–1)</td><td align="left" rowspan="1" colspan="1">0.60 ± 0.02</td><td align="left" rowspan="1" colspan="1">(0–1)</td><td align="left" rowspan="1" colspan="1">0.005</td><td align="left" rowspan="1" colspan="1">0.80</td></tr></tbody></table><table-wrap-foot><p><italic>AD, amateur dancer; CG, control group; Values are means, SEM</italic>.</p></table-wrap-foot></table-wrap><fig id="F2" position="float"><label>Figure 2</label><caption><p><bold>Average indices of performance (IP) characterizing cognition, RTs, posture&balance as well as motor and tactile performance</bold>. Higher indices were found for the AD group in all domains, with largest advantages for posture and balance. In all cases, performances of the left and right hand were pooled. “Cognition” (<italic>p</italic> = 0.010) comprises <italic>RSPM</italic> and <italic>AKT</italic>. “Reaction times” (<italic>p</italic> = 0.003) were averaged for all fingers and for the left and right hand. “Posture&balance” (<italic>p</italic> < 0.001) comprises <italic>Romberg test</italic>, <italic>Standing-turn test</italic> and <italic>Up&go test</italic>. “Motor performance” (<italic>p</italic> = 0.012) comprises <italic>Steadiness, Aiming, Pin plugging</italic> and <italic>Tapping</italic>. “Tactile performance” (<italic>p</italic> = 0.005) comprises <italic>touch thresholds</italic> and <italic>2-point-discrimination thresholds</italic>. Vertical bars show standard error of the mean. Asterisks mark significant differences between the two groups.</p></caption><graphic xlink:href="fnagi-02-00031-g002"></graphic></fig><p>Our findings demonstrated a general advantage for the group of AD, which spans cognitive, perceptual and motor performance. In order to obtain insight into possible differences of the distribution of the individual data-sets, we performed categorical analysis of IP (binned into >0.5 and <0.5). In all of the 5 domains analyzed, the CG group showed a higher occurrence of IPs lower 0.5 (subjects with index <0.5, “Cognition”: AD = 11.47%, CG = 36.26%, χ<sup>2</sup> = 11.57, <italic>p</italic> = 0.001; ”RTs”: AD = 14.58%, CG = 44.74%, χ<sup>2</sup> = 12.086, <italic>p</italic> = 0.001; “Posture&balance”: AD = 32.43%, CG = 70.37%, χ<sup>2</sup> = 17.99, <italic>p</italic> ≤ 0.001; “Motor performance”: AD = 5.91%, CG = 24.59%, χ<sup>2</sup> = 38.16, <italic>p</italic> ≤ 0.001: “Tactile performance”: AD = 0%, CG = 30.77%, χ<sup>2</sup> = 25.51, <italic>p</italic> ≤ 0.001). Accordingly, the overall superior advantage of AD individuals did not come from the fact that their best performers were better than those of the CG group, but because the AD group lacked poor performer as frequently present in the CG group.</p></sec></sec><sec sec-type="discussion"><title>Discussion</title><p>We investigated the impact of multi-year AD in a group of 24 elderly subjects, who had an average record of regular dancing of 16.5 years. In addition to posture and balance, which are closely related to dancing, we performed a broad assessment of cognitive, attentional, perceptual and sensorimotor abilities. We found that in each of the different categories investigated, the AD group showed a superior performance as compared to the non-dancer CG group. The largest advantage was found for posture and balance parameters, which is in line with previous findings showing beneficial effects of dance on fitness and posture (Hopkins et al., <xref ref-type="bibr" rid="B38">1990</xref>; Estivill, <xref ref-type="bibr" rid="B22">1995</xref>; Adiputra et al., <xref ref-type="bibr" rid="B1">1996</xref>; Crotts et al., <xref ref-type="bibr" rid="B13">1996</xref>; Shigematsu et al., <xref ref-type="bibr" rid="B69">2002</xref>; Kreutz, <xref ref-type="bibr" rid="B49">2008</xref>; Sofianidis et al., <xref ref-type="bibr" rid="B71">2009</xref>).</p><p>Falls are a major health problem in an aging society, which arise as a consequence of a decline in postural and balance due to muscle weakness and other risk factors (Melzer et al., <xref ref-type="bibr" rid="B56">2001</xref>; Sturnieks et al., <xref ref-type="bibr" rid="B73">2008</xref>). Falls, or even the fear of falling lead to a reduced quality of life (Voermans et al., <xref ref-type="bibr" rid="B80">2007</xref>). Therefore, various forms of intervention programs have been developed to counteract the risk of falling, many of them employ dancing. On the other hand, attempts have been made to identify specific risk factors. For example, reaction times, which require high attention, fast and well-coordinated motor responses and intact sensation, have been identified as a reliable predictor for the risk of falls (Lajoie and Gallagher, <xref ref-type="bibr" rid="B50">2004</xref>). Our findings are compatible with a critical role of RTs in describing the overall status of elderly individuals, as the AD group showed significantly shorter reaction times than the CG.</p><p>To address a possible general decline of motor performance with increasing age besides that related to posture and balance, we measured different parameters of hand-arm functions. Subjects of the AD group showed an overall better performance for hand-arm steadiness, control precision and wrist movements. While some aspects of maintained hand-arm function might be directly related to dancing activity such as preserved muscle strength and sensorimotor coordination, other more unspecific factors such as attention and concentration might also play an important role, particularly for tasks requiring steadiness. In fact, the group of AD showed a better performance in the geriatric concentration test.</p><p>Superior posture and balance can be linked to the requirements imposed by dancing, which is to some extent also true to superior hand-arm function as discussed above. In contrast, tactile abilities appear rather unrelated to dancing. For example, enhanced tactile discrimination abilities found in blind Braille readers have been associated with the unusual and extensive use of the fingers to gather fine-scale spatial tactile information (Van Boven et al., <xref ref-type="bibr" rid="B76">2000</xref>; Goldreich and Kanics, <xref ref-type="bibr" rid="B31">2003</xref>). Similarly, tactile acuity in professional pianists is significantly higher as compared to non-musicians, which has been attributed to the extreme usage of the fingers during piano playing (Ragert et al., <xref ref-type="bibr" rid="B63">2004</xref>). We therefore suggest that the superior 2pd performance found in the AD group might reflect unspecific factors that are independent of dancing activities and beyond the framework of use. Interestingly, in a recent study of experienced adult Tai Chi practitioners superior spatial tactile acuity in comparison to matched controls has been reported (Kerr et al., <xref ref-type="bibr" rid="B45">2008</xref>). This has been explained by assuming that either individuals with a high fitness are drawn to Tai Chi, or that Tai Chi itself drives cortical changes which lead to superior tactile acuity. We here suggest that the enhanced tactile discrimination performance arises as a consequence of increased levels of neurotrophins, which are up-regulated during dancing, and which might also be up-regulated in Tai Chi practitioners.</p><p>The fact that both AD and CG groups did not differ in respect to absolute touch threshold is compatible with recent observations in elderly individuals according to which tactile acuity can be improved by repetitive sensory stimulation procedures, while absolute touch thresholds remain unchanged (Dinse et al., <xref ref-type="bibr" rid="B18">2005</xref>, <xref ref-type="bibr" rid="B19">2006</xref>). This observation has been taken as an argument that tactile acuity can be improved through changes of synaptic efficacy and synaptic connections, and therefore is subject to neuroplasticity mechanisms. In contrast, touch thresholds seem to reflect predominantly peripheral factors such as mechanoreceptor density and mechanoreceptor composition, which are independent of cortical plasticity processes.</p><p>Use-dependent plasticity, synaptic efficacy and the maintenance of synaptic connections are controlled and modulated by neurotrophins, such as brain-derived neurotrophic factor (BDNF). BDNF levels are increased by many factors such as physical activity and social interaction (Neeper et al., <xref ref-type="bibr" rid="B58">1995</xref>; Churchill et al., <xref ref-type="bibr" rid="B8">2002</xref>; Kramer et al., <xref ref-type="bibr" rid="B46">2006</xref>; Vaynman and Gomez-Pinilla, <xref ref-type="bibr" rid="B77">2006</xref>). In particular, housing animals under enriched environmental conditions has been shown to increase neurotrophine gene expression and thus exerting neuroprotective functions (Young et al., <xref ref-type="bibr" rid="B82">1999</xref>; Pham et al., <xref ref-type="bibr" rid="B61">2002</xref>; Mattson et al., <xref ref-type="bibr" rid="B54">2004</xref>). More generally, mild stress response in cells has been advocated as a major driving source up-regulating stress resistance genes and growth factors (Mattson, <xref ref-type="bibr" rid="B53">2008</xref>). Interestingly, among the factors inducing mild stress are sensory stimulation, physical activity and cognitive challenges, all of them involved in dancing.</p><p>The overall superior performance of the AD group in comparison to the controls is highly compatible with these constraints, and with the well-documented positive effects induced by physical activities (Kramer et al., <xref ref-type="bibr" rid="B47">1999</xref>, <xref ref-type="bibr" rid="B46">2006</xref>; Vaynman and Gomez-Pinilla, <xref ref-type="bibr" rid="B77">2006</xref>; Deley et al., <xref ref-type="bibr" rid="B15">2007</xref>; Sumic et al., <xref ref-type="bibr" rid="B74">2007</xref>; Hillman et al., <xref ref-type="bibr" rid="B36">2008</xref>; Voelcker-Rehage et al., <xref ref-type="bibr" rid="B79">2010</xref>). It is noteworthy that besides the aspects of physical exercise and the requirements for fine-motor coordination, posture and balance, the emotional aspects of dancing and its close association to music might add further beneficial effects (cf. Gazzaniga, <xref ref-type="bibr" rid="B28">2008</xref>). Studies in children demonstrated that intensive music training was associated with improved performance in the core mathematical system for representing abstract geometry indicating a fundamental association between musical and mathematical cognition (Spelke, <xref ref-type="bibr" rid="B72">2008</xref>). Similarly, learning to dance by effective observation appeared to be closely related to learning by physical practice, both in the level of achievement and also the neural substrates that support the organization of complex actions (Cross et al., <xref ref-type="bibr" rid="B12">2009</xref>). Conceivably, other cognitive skills might benefit from effective observational learning typically associated with dancing.</p><p>The analysis of IP, which were calculated to allow direct comparison of performance across all individual tests, provided insight into the question why the AD group was characterized by a general better performance throughout all categories investigated. We found that individuals of the AD group were not characterized by an absolutely better performance than that observed in individuals of the CG group. Instead, the AD group lacked individuals showing poor performance, which was frequently found for the CG group. This observation implies that maintaining an active lifestyle into old age can preserve cognitive, motor and perceptual abilities and prevent them from degradation, but might not drive levels of performance beyond those typically found in aged populations.</p><p>Our data showed that the AD group reached higher scores in everyday competence as assessed by the ECQ questionnaire which addressed aspects of independence in activities of daily living and mobility, social relations, general health status and life contentment. These findings are in line with a previous study investigating the role of cultural activities, including music, singing and dance for health and life style (Kreutz, <xref ref-type="bibr" rid="B49">2008</xref>). According to this study, dancers were characterized by high-level education and socio-economic status, and their motivation for regular dancing was predominantly driven by both hedonistic and social factors. This raises the question whether the observed superior performance of the AD group was in fact evoked by dancing, or weather a subpopulation characterized by unusual high fitness choose an active lifestyle during early adulthood that included dancing, and is able to maintain such a lifestyle over many years. Recent data from an intervention study in a pre-post design showed that after a 6-months dance course elderly participants improved in all aspects tested similar to those described here including perception and cognition (Kattenstroth et al., <xref ref-type="bibr" rid="B44">2009</xref>). These data suggest that dancing in fact plays a crucial role in mediating wide-range beneficial effects. On the other hand, a correlation analysis between outcome measures and the weekly workload as well as the total amount of dancing experience in years revealed significant relationships only for one balance parameter (total amount of dancing experience) and for sensory discrimination thresholds (weekly workload). While this might imply a limited causal role of dancing in mediating positive effects, our recent intervention study demonstrated substantial benefits after a few months of intervention. As a result, potential long-term effects from years of dancing might have saturated resulting in a lack of correlation between outcome measures and amount of dancing experience. Conceivably, both individual predispositions and dancing might play a role in the maintenance of perceptual and cognitive abilities in old age. Apparently, further studies are needed to disentangle their possible contributions.</p><p>Compared to activities such as exercising, walking or playing an instrument, dance has the advantage to combine many diverse features including physical activity, social and emotional interaction, each of them well-documented to have beneficial effects. This unique property might be one reason for its general acceptance and its high compliance. Our study provides strong evidence that dance promotes a wide-range of beneficial effects that are not limited to motor behavior, posture and balance, but covers also perceptual and cognitive abilities. Therefore, dance might be an appropriate approach for enforcing and maintaining plasticity processes in elderly populations, thereby contributing to successful aging.</p></sec><sec><title>Conflict of Interest Statement</title><p>One Author (Jan–Christoph Kattenstroth) is a recipient of a stipend from the Allgemeine Deutsche Tanzlehrerverband (ADTV).</p></sec></body><back><ack><title>Acknowledgment</title><p>Parts of the work have been supported by a grant from the Deutsche Forschungsgemeinschaft to HRD (DFG Di 334/10-4). Jan-Christoph Kattenstroth is a recipient of a stipend from the Allgemeiner Deutscher Tanzlehrerverband (ADTV). 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